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Telephone Modem Battery

Solution

The telephone service installed by Cox may utilize a telephone modem (eMTA) that includes one or two batteries. 
 

In the event that a power outage occurs, the battery or batteries provides up to eight hours of power to operate the telephone modem. While in most cases the batteries will not need to be replaced for several years, it is recommended that you check the status of your battery regularly.

Alarm System Responsibilities

For customers who have alarm systems, refer to the Cox Business Commercial Service Agreement for more information regarding your responsibilities as it relates to Alarm Systems.

Modem Status Indicator Lights

All of the telephone modems Cox uses for telephone service have at least eight status indicator lights. The number of lights depends on the number of telephone lines the modem can support and how many are installed. The status indicator lights are clearly marked. Usually, the Battery status indicator light will be located on the left-hand side of the status indicator light field. On some models, the Battery and Power status indicator lights are reversed.
 
Battery
indicates the status of the battery in the modem and Power indicates whether AC power is available to the unit. Both of these status indicator lights should produce a steady green light.
 
Here are the statuses indicated by the battery and power lights.
 

eMTA Model Power Light Battery Light Status

Arris models:

  • TM402
  • TM502
  • TM504
  • TM602
  • TM604
  • TM608
  • TM822
  • TM804
Solid Solid Green No problem
Flashing Green Action Required
Off Missing

Motorola models:

  • SBV5220
  • SBV5222
  • SBV5322
Solid Solid Green No problem
Flashing Green Action Required
Off Missing

For Arris models 508 and 512, contact Cox Communications.

Potential Corrective Actions

Here are a few troubleshooting steps you can try on your own.

  • If the Power Light is off or flashing, check the power source to ensure the device is plugged into a wall outlet or power strip. If it is plugged into a power strip, ensure the switch is on.
  • Ensure the eMTA’s power cord is tightly connected to the device.
  • If the device is connected to a power strip, bypass the power strip and plug the eMTA directly into a wall outlet.

If the above actions do not result in the status lights displaying a solid green light, contact us immediately.

Additonal Questions and Answers

View the following questions and answers about Telephone Modem Batteries.

How will I know if the battery in the telephone modem Cox installed is working properly?

There are several “Status Indicator Lights” on the front of the telephone modem. Under normal circumstances, the light labeled “Battery” will provide a steady green light. If it is blinking or is off, there are a few quick checks you can do that may correct the situation:

  • Check the commercial power source to ensure the device is plugged into a wall outlet or power strip. If it is plugged into a power strip, ensure the switch is on.
  • Ensure the eMTA’s power cord is tightly connected to the device.
  • If the device is connected to a power strip, bypass the power strip and plug the eMTA directly into a wall outlet.

If the above actions do not result in the status lights displaying a solid green light, contact us immediately.

How long will my phone service last if the commercial power fails in my building?

Usually, the battery in your Cox provided telephone modem should last about eight hours under normal operating conditions. This capacity will slowly diminish over time, as does the effectiveness of any battery. The battery powers the telephone modem only and will not sustain service during a network outage. If you connect equipment not owned by Cox to the Cox-provided eMTA, you are responsible for ensuring that the equipment you’ve provided functions in a power outage or other emergency.

How much capacity is available if the Battery status indicator light is blinking?

The Battery status indicator light will begin to blink when the reserve capacity of the battery in your telephone modem reaches about 60 minutes. If the commercial power supply to the telephone modem is turned off, the Battery status indicator will begin to blink much sooner. This condition may or may not have anything to do with the expected reserve capacity of the battery. Blinking indicates a low charge and does not necessarily indicate the battery’s capacity to charge is low.